Dental disk-carrier



(Model.)

M. L. ROWE.

DENTAL DISK GARRIER.

Patented Jan. 20, 1891.

www MQW.

we mms versus co., maro-uma., msumumn, u4 c.

UNITED STATES PATENT OFFICE.

MARVIN L. itowE, or ALBANY, NEw YORK.

DENTAL DISK-CARRIER.

SPECIFICATION forming part of Letters Patent No. 444,856, dated January 20, 1891.

Application filed April 2, 1890. Serial No. 346,350. (Model.)

To all whom t may concern:

Be it known that I, MARVIN L. ROWE, acitizen of the United States, residing at Albany, in the count-y of Albany and State of New York, have invented certain newand useful Improvements in Dental Disk-Carriers, of which the following is a specification.

My invention relates to handmandrels used by dentists to support a grinding or polishing disk, and has for its objects to provide suitable means for readily mounting the disk upon the mandrel while in motion, and also to secure the disk to the mandrel, so that it will not become loose when in operation, and especially when the motion of the mandrel is reversed. These objects I accomplish by substantially the means illustrated in the accompanying drawings, in Which- Figure l is a side view of a carrier embodying my invention, together with the handpiece of a dental engine. Fig. 2 is a plan viewof the upper end of the same. Fig. S is a horizontal cross-section showingv a 4back supporting-flange provided with an extending iin.

As illustrated in the drawings, A represents the main shank of a mandrel secured in the hand-piece I of a dental engine. The upper end ot' the mandrel is reduced and terminates in a point B, which is preferably made blunt or rounded for the purpose hereinafter specified. This end of the mandrel is provided with a spiral flange or worm C, which begins below the point B and extends around the mandrel, preferably one and onehalf turn. The number of turns maybe varied, however, without departing from my invent-ion. The edge of the spiral flange is made sharp, so as to readily cut its way into the disk, and the terminating end of the spiral is flared upward, leaving but little space' between said end and the spiral above, the space being less than the thickness of the disk used.

A flange E is :formed on the mandrel below the spiral and may be provided witha iin F, extending outward at a right angle to the face of the flange. This iin is formed at a point below and opposite the daring or upturned vded with a central hole corresponding in diameter with the end B of the mandrel, may be secured tothe mandrel by simply inserting the end B into said hole. The turning of the machine then causes the disk to travel along the spiral and to automatically tighten itself on the machine.

Then in operation, the disk is continually pressed against the face of the flange E,which serves as a back or support when presshre is applied in the direction of the Harige, and the sides ot' the knife-spirals serve as lateralsnpport for the disk when the pressure is applied in the opposite direction. When the disk is in place on the mandrel, the fin F embeds itself into the side of the disk and prevents the disk from turning, and the disk is prevented by the upturned end G of the spiral from becoming loose by unscrewing itself when the motion of the mandrel is reversed, thereby resisting any movement of the disk on the mandrel in that direction. I prefer to make the end B of the mandrel blunt or dull, so that if a disk is picked up by said pointfrom the palm of the hand the pointwill not cut or injure the operator, although the end may be provided with a sharp point without departing from my invention.

That I claim isl. In a disk-carrier, the combination, with a main shank, of a spiral flange having a cutting-edge and an upturned lower end, and a supporting-flange arranged below said spi ral, substantially as shown and described.

2. In a disk-carrier, the combination, with a main shank, ot' a spiral flange having a cutting-edge and an upturned lower end, and a supporting-llange having a fin extending outward from its face, substantially as shown and described.

MARVIN L. ROWE.

VWitnesses:

BUEL C. ANDREWS, JOHN S .WOLFE, 

